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Amplifier And Detector Type 55A With Headphones, by Marconi Company, London, c. 1920

Inventory Number: 18067

18067-2t 18067-4t 18067-1t 18067-3t

Date: c. 1920

Maker Details: Signed by Marconi's Wireless Telegraph Co. Ltd.

Inscription: "M.W.T. CO. LTD. LONDON / AMPLIFIER NO 181868 / TYPE NO 55 A / NO OF VALVES 7 / WAVE RANGE 600 - 5000m / H.T. VOLTS 50" on plastic plaque on interior of teak frame.

Size: 360 x 200 x 170 mm

Materials: Glass, teak, steel, brass.

Other Given Number(s): Christie's 58, 782/1t (white tag).


Amplifier and Detector Type 55A With Headphones, with seven 'Marconi' V24 valves, two sliding potentiometers, numerous terminals, dovetailed teak frame and japanned steel case. Thirteen brass terminals marked "6 VOLTS + -", "H.T. VOLTS + -", "120 Ohms TELEPHONES", "E", "F", and "G". With earphones. This amplifier and detector formed part of a Marconi No.6 direction finding station. It was used along with a radiogoniometer, tuning condenser, transformer, battery and wavemeter.

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